help ! how to maximize the transmitting signal of the ordinary REMOTE CONTROL toy car,boat or helicopter .....???

i have many remote control toy cars and speed boat but when they get further the signal of my transmitter can't reach them...i just want my RC to reach further to make it more useful.........   pls help !!!!...... thank you !!!!....

Try the following:
1 - Replace the transmitters and/or receivers with more powerful ones. You might need to get a better power supply.
2 - If the attennae are bent, replace it. If they're the curved or limp kind, straighten them with straws.
3 - get a longer attenna for the controller
There's a few idea for you.